You need to select the "HD" tab, then - if it's there - keep pressing the "Up" button (which is 8^ below the screen) till you can't go any further.
Create the new folder called -Styles-24 there. The HD is the "E" drive, so this creates the folder E:\-Styles-24
Then copy the style into there.
The reason for doing this is that the registration file contains a pointer to the style file, which it expects to find in E:\-Styles-24. So if the style is anywhere else, the registration will not find it.